SOLUTION: why do the equations for rectangles also work for parallelograms?

SOLUTION: why do the equations for rectangles also work for parallelograms?

Algebra.Com

Question 344046: why do the equations for rectangles also work for parallelograms?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
Because they both have 2 sets of parallel sides & opposite angles are equal.
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